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    <title>macros and limits</title>
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    <div class="refentry">
      <a id="idm1"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="limits"></a>
        <h1>Macros and Limits</h1>
        <p>
Macro value limitations.
        </p>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
		The macro names given in the following list must use the values specified. These constant
expressions are suitable for use in #if preprocessing directives.
		</p>
        <p>
        </p>
        <div class="informaltable">
          <table class="informaltable" border="0">
            <colgroup>
              <col align="left" class="col1" />
              <col align="left" class="col2" />
            </colgroup>
            <tbody>
              <tr>
                <td align="left">
                  <code class="code">#define FLT_DIG</code>
                </td>
                <td align="left">
                  <code class="code">6</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define FLT_MANT_DIG</code>
                </td>
                <td align="left">
                  <code class="code">24</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define FLT_MAX_10_EXP</code>
                </td>
                <td align="left">
                  <code class="code">+38</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define FLT_MAX_EXP</code>
                </td>
                <td align="left">
                  <code class="code">+128</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define FLT_MIN_10_EXP</code>
                </td>
                <td align="left">
                  <code class="code">-37</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define FLT_MIN_EXP</code>
                </td>
                <td align="left">
                  <code class="code">-125</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define FLT_RADIX</code>
                </td>
                <td align="left">
                  <code class="code">2</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define FLT_MAX</code>
                </td>
                <td align="left">
                  <code class="code">0x1.fffffep127f</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define FLT_MIN</code>
                </td>
                <td align="left">
                  <code class="code">0x1.0p-126f</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define FLT_EPSILON</code>
                </td>
                <td align="left">
                  <code class="code">0x1.0p-23f</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define CHAR_BIT</code>
                </td>
                <td align="left">
                  <code class="code">8</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define CHAR_MAX</code>
                </td>
                <td align="left">
                  <code class="code">SCHAR_MAX</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define CHAR_MIN</code>
                </td>
                <td align="left">
                  <code class="code">SCHAR_MIN</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define INT_MAX</code>
                </td>
                <td align="left">
                  <code class="code">2147483647</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define INT_MIN</code> </td>
                <td align="left">
                  <code class="code">(-2147483647- 1)</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define LONG_MAX</code> </td>
                <td align="left">
                  <code class="code">0x7fffffffffffffffL</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define LONG_MIN</code> </td>
                <td align="left">
                  <code class="code">(-0x7fffffffffffffffL- 1)</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define SCHAR_MAX</code> </td>
                <td align="left">
                  <code class="code">127</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define SCHAR_MIN</code> </td>
                <td align="left">
                  <code class="code">(-127 - 1)</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define SHRT_MAX</code> </td>
                <td align="left">
                  <code class="code">32767</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define SHRT_MIN</code> </td>
                <td align="left">
                  <code class="code">(-32767- 1)</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define UCHAR_MAX</code> </td>
                <td align="left">
                  <code class="code">255</code>
                </td>
              </tr>
              <tr>
                <td align="left">
                  <code class="code">#define USHRT_MAX</code>
                </td>
                <td align="left">
                  <code class="code">65535</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define UINT_MAX</code> </td>
                <td align="left">
                  <code class="code">0xffffffff</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define ULONG_MAX</code> </td>
                <td align="left">
                  <code class="code">0xffffffffffffffffUL</code>
                </td>
              </tr>
            </tbody>
          </table>
        </div>
        <p>
		</p>
        <p>
		The macro names given in the following list (available if the built-in math functions are extended with  <a class="citerefentry" href="cl_khr_fp64.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp64</span></span></a>) must use the values specified. These constant
expressions are suitable for use in #if preprocessing directives.
		</p>
        <p>
        </p>
        <div class="informaltable">
          <table class="informaltable" border="0">
            <colgroup>
              <col align="left" class="col1" />
              <col align="left" class="col2" />
            </colgroup>
            <tbody>
              <tr>
                <td align="left"><code class="code">#define DBL_DIG</code> </td>
                <td align="left">
                  <code class="code">15</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define DBL_MANT_DIG</code> </td>
                <td align="left">
                  <code class="code">53</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define DBL_MAX_10_EXP</code> </td>
                <td align="left">
                  <code class="code">+308</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define DBL_MAX_EXP</code> </td>
                <td align="left">
                  <code class="code">+1024</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define DBL_MIN_10_EXP</code> </td>
                <td align="left">
                  <code class="code">-307</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define DBL_MIN_EXP</code> </td>
                <td align="left">
                  <code class="code">-1021</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define DBL_MAX</code> </td>
                <td align="left">
                  <code class="code">0x1.fffffffffffffp1023</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define DBL_MIN</code> </td>
                <td align="left">
                  <code class="code">0x1.0p-1022</code>
                </td>
              </tr>
              <tr>
                <td align="left"><code class="code">#define DBL_EPSILON</code> </td>
                <td align="left">
                  <code class="code">0x1.0p-52</code>
                </td>
              </tr>
            </tbody>
          </table>
        </div>
        <p>
		</p>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p>
            <img src="pdficon_small1.gif" />
                                                 
            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.0.pdf#page=178" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="mathFunctions.html"><span class="citerefentry"><span class="refentrytitle">Math Functions</span></span></a>, 
			<a class="citerefentry" href="mathConstants.html"><span class="citerefentry"><span class="refentrytitle">Symbolic Math Constants</span></span></a>, 
			<a class="citerefentry" href="FP_CONTRACT.html"><span class="citerefentry"><span class="refentrytitle">Floating Point Pragma</span></span></a>,
			<a class="citerefentry" href="scalarDataTypes.html"><span class="citerefentry"><span class="refentrytitle">Scalar Data Types</span></span></a>, 
			<a class="citerefentry" href="vectorDataTypes.html"><span class="citerefentry"><span class="refentrytitle">Vector Data Types</span></span></a>, 
			<a class="citerefentry" href="reservedDataTypes.html"><span class="citerefentry"><span class="refentrytitle">Reserved Data Types</span></span></a>,
			<a class="citerefentry" href="otherDataTypes.html"><span class="citerefentry"><span class="refentrytitle">Other Data Types</span></span></a>
        </p>
      </div>
      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2009 The Khronos Group Inc. 
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
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